Who was the leader of the USSR in the first part of the Cold War?

Nikita Khrushchev

Explanation:

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As mentioned in the question, first part of cold war. It was Joseph Stalin or simply Stalin under who the second World war ended and unfortunately the Cold war began.

He created and changed USSR (Soviet Union) into a Superpower during war of struggles in the 20th century. So, we can say that he was one of the greatest dictator of all time.

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explanation:

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basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.